Add a config.mk file where global variables can be modified, add aarch64

interrupts with IRQ and syscalls, make phys_to_virt checked, recreate
stack on aarch64, make serial console finally line wrap and have max
height correctly, add U64Buf for when i need number debug, rename mouse
and keyboard files to kmi and merge them, add non-working pl050 support

kernel/Cargo.toml

@@ -23,6 +23,7 @@ x86_64 = "0.15.4"
 
 [target.'cfg(target_arch = "aarch64")'.dependencies]
 aarch64-cpu = "11.2.0"
+fdt = "0.1.5"
 
 [profile.dev]
 panic = "abort"